The documentation of the module is fairly sparse but it seems to be enough.
The installation of the module itself was fairly painless. However, the installation of the spidermonkey library is not so painless, and unfortunately the "system" version of spidermonkey which comes with some free OSes seems usually to be broken, so it is necessary to self-install the library. The reviewer who complained about the installation problems surely must have had problems with that.
The following page was pretty helpful in installing spidermonkey:
Sorry, but the above blog page is gone now, unfortunately. But I have something which may be useful on my website:
2 hidden unhelpful reviews